The case of Richard Lyon and John Lewis, who deny charges of unacceptable professional conduct after refusing to tell the ARB whether or not they have professional indemnity insurance, is set to recommence.
The case - which began last November before being adjourned - has become something of a cause celebrefor anti-ARB campaigners, such as Ian Salisbury, who have backed Lyon and Lewis.
This loose group, together with Lyon and Lewis themselves, has long argued that it is not the business of the board to force architects to have high levels of insurance.
Today's hearing, in London, is seen by the group as a test case for this highly contentious policy, which has been at the heart of much of the controversy that has beset the board over recent years.
During the earlier hearing, the duo successfully forced the resignation of Barbara Saunders from the committee they faced because they argued that she was subject to a conflict of interest.
The case is expected to last for two days.